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PartsTable / COMPONENT / 5310L20-012
5310L20-012 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.057 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN, hole_diameter: 0.266 INCHES NOMINAL IN, hardness_rating: 90.7 ROCKWELL B MINIMUM OR 102.0 ROCKWELL B MAXIMUM, overall_diameter: 0.625 INCHES NOMINAL IN, surface_treatment: CADMIUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-637-2112, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
5310L20-012
NSN: 5310-00-637-2112
FSC: 5310
CAGE: 81996 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.057 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
hole_diameter0.266 INCHES NOMINAL IN
hardness_rating90.7 ROCKWELL B MINIMUM OR 102.0 ROCKWELL B MAXIMUM
overall_diameter0.625 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-637-2112
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5310L20-012 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
HOLE DIAMETER: 0.266 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
THICKNESS: 0.057 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
•
HARDNESS RATING: 90.7 ROCKWELL B MINIMUM OR 102.0 ROCKWELL B MAXIMUM
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM OVERALL
HOLE DIAMETER0.266 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
THICKNESS0.057 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
HARDNESS RATING90.7 ROCKWELL B MINIMUM OR 102.0 ROCKWELL B MAXIMUM
PERIPHERAL SHAPE STYLEROUND
OVERALL DIAMETER0.625 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
12376Interchangeable
interchangeable cross-reference
interchangeable
3H18CInterchangeable
interchangeable cross-reference
interchangeable
10116Interchangeable
interchangeable cross-reference
interchangeable
53236Interchangeable
interchangeable cross-reference
interchangeable
2511 2-1/8Interchangeable
interchangeable cross-reference
interchangeable
705C13Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5310L20-012?
5310L20-012 is a WASHER,FLAT.
What parts can replace 5310L20-012?
There are 18 known substitutes for 5310L20-012: 12376, 3H18C, 10116 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5310L20-012?
5310L20-012 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-637-2112. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026